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Abstract

The purpose of the Voice File Interchange Protocol (VFIP) is to
permit the interchange of various types of speech files between
different systems. Currently, there are many different types of
voice implementations, but no specific standard has been set with an
eye towards compatability between these systems. With the increasing
interest and development of voice, specifically in Multimedia Mail,
there is an increased need to include standardized speech into a
common data structure.

Country

United States

Language

English (United States)

This text was extracted from a ASCII document.

This is the abbreviated version, containing approximately 59% of the total text.

This memo describes a proposed voice file interchange format for use in the ARPA-Internet community. Suggestions for improvement are encouraged. Distribution of this memo is unlimited.

1. INTRODUCTION

The purpose of the Voice File Interchange Protocol (VFIP) is to permit the interchange of various types of speech files between different systems. Currently, there are many different types of voice implementations, but no specific standard has been set with an eye towards compatability between these systems. With the increasing interest and development of voice, specifically in Multimedia Mail, there is an increased need to include standardized speech into a common data structure.

The Voice File Interchange Protocol defines a header to describe the voice data. The 18-byte header contains the identifier, the header version number, the header length, a DTMF mask for Touch-Tones, the recording rate in bits per second, the total time in deci-seconds (tenths of a second), and the encoding/recording method (see Figure 1).

2. THE VOICE FILE INTERCHANGE PROTOCOL HEADER

The Voice File Interchange Protocol header is organized as follows:

2.1 The Header Version Number

The version number is 1-byte. This first version is number one.

2.2 The Header Length

The length is a 1-byte field indicating the length of the entire header in bytes. For this first version, the length is 18 (bytes).

Reynolds, et al. [Page 1]

Voice File Interchange Protocol RFC 978

2.3 The DTMF Mask

This field describes what is known about DTMF Touch-Tones in the data. The field consists of a 16 flag bits which indicate what is known about particular DTMF tones. The 16 possible DTMF tones, in order, are: 0 1 2 3 4 5 6 7 8 9 A B C D. The low order bit of the field is tone 0.

A 1-bit signifies that the corresponding tone is guaranteed NOT to be in the speech file. A 0-bit signifies that it may or may not be in the speech file. Therefore, a field of 16 zeros denotes that nothing is known about the tones. A field of 16 ones denotes that there are no tones in the file.

2.4 Recording Rate

The recording rate is a 32-bit field and is the approximate rate in bits/second of the method used to record the speech. For variable rate methods, this may be very approximate.

2.5 Total Time

A 32-bit number indicating the total time of the recording in deci-seconds. For example, 600 indicates 1 minute of speech.

2.6 Methods of Encoding/Recording

This 6-byte ASCII field indicates the method of encoding/recording. Names shorter than six characters are padded out to the right with blanks (the ASCII space...